“双高”配电网下变电站并联电容器灵活投切  

Flexible Switching of Shunt Capacitors in Highly Renewable and Highly Power Electronics Distribution Network

作　　者：李建文[1] 杨瑞卿 李戎 马小棠 LI Jianwen;YANG Ruiqing;LI Rong;MA Xiaotang(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学电气与电子工程学院,保定071003

出　　处：《电力系统及其自动化学报》2023年第2期132-139,共8页Proceedings of the CSU-EPSA

基　　金：中央高校基本科研业务专项资金资助项目(2020MS095)。

摘　　要：针对目前变电站并联电容器组投切方案存在的设备利用率低和易受双高配电网宽频谐波影响而损坏的问题,提出一种考虑谐波宽频特性的并联电容器组灵活投切策略。首先,建立10 kV配电网并联补偿模型和电容器组投切方案集合。然后,运用模态分析法确定投切方案网络谐振点。最后,从并联补偿方案的谐波谐振机理出发,设计程序计算谐波电流放大倍数,确定并联补偿方案基本可行域,筛选出最优投切组合。算例仿真表明,该投切策略能在实现原有无功补偿的功能上,提高设备总体利用率,避免并联电容器组投入后产生的谐波谐振和谐波电流放大。Aimed at the problems of low equipment utilization and susceptibility to damage caused by wide-frequency harmonics in a highly renewable and highly power electronics distribution network in the existing switching scheme for shunt capacitor banks in substations,a flexible switching strategy for shunt capacitor banks considering the wide-frequency characteristics of harmonics is proposed.First,a parallel compensation model of 10 k V distribution network and a set of switching schemes for capacitor banks are established.Then,the modal analysis method is used to determine the network resonance point.According to the harmonic resonance mechanism of the parallel compensation scheme,a program is designed to calculate the magnification of each order harmonic current.Afterwards,the basic feasible region in the parallel compensation scheme is determined,and the optimal switching scheme is selected.Finally,the simulation results of an example show that the proposed switching strategy can improve overall equipment utilization while achieving the basic functions of reactive power compensation.In addition,it can avoid the harmonic resonance and harmonic current amplification when the shunt capacitor banks are put in.

关 键 词：配电网 并联电容器 模态分析 电容器组投切 谐波抑制 

分 类 号：TM72[电气工程—电力系统及自动化]